diff --git a/src/pocketmine/level/generator/GenerationLevelManager.php b/src/pocketmine/level/generator/GenerationLevelManager.php
index 73bae1b0f..0ab3e706d 100644
--- a/src/pocketmine/level/generator/GenerationLevelManager.php
+++ b/src/pocketmine/level/generator/GenerationLevelManager.php
@@ -110,7 +110,7 @@ class GenerationLevelManager extends GenerationManager{
 		if(!isset($this->requestQueue[$levelID])){
 			$this->requestQueue[$levelID] = [];
 		}
-		if(!isset($this->requestQueue[$levelID][$index = "$chunkX:$chunkZ"])){
+		if(!isset($this->requestQueue[$levelID][$index = Level::chunkHash($chunkX, $chunkZ)])){
 			$this->requestQueue[$levelID][$index] = 1;
 		}else{
 			$this->requestQueue[$levelID][$index]++;
diff --git a/src/pocketmine/level/generator/GenerationManager.php b/src/pocketmine/level/generator/GenerationManager.php
index 85c2195c1..a27bc00d1 100644
--- a/src/pocketmine/level/generator/GenerationManager.php
+++ b/src/pocketmine/level/generator/GenerationManager.php
@@ -174,7 +174,7 @@ class GenerationManager{
 		if(!isset($this->requestQueue[$levelID])){
 			$this->requestQueue[$levelID] = [];
 		}
-		if(!isset($this->requestQueue[$levelID][$index = "$chunkX:$chunkZ"])){
+		if(!isset($this->requestQueue[$levelID][$index = Level::chunkHash($chunkX, $chunkZ)])){
 			$this->requestQueue[$levelID][$index] = 1;
 		}else{
 			$this->requestQueue[$levelID][$index]++;